Synch issue: is it unique to Moviefactory?

[jdcampbell]

There is so much information on this issue, but it is all a bit confusing. All I am trying to do is open a video from the DVD, chop some bits out and save it back again. Surely it shouldn't be so difficult.

Do alternative products, like Pinnacle Studio have the same problem? Do Ulead acknowledge the issue? Is there a fix planned?

[heinz-oz]

Don't know how much you know about mpeg2 compression (DVD). Depending on the size of the GOP, there will be a considerable number of frames in between the I frames. Only I frames hold all the information. All frames in between only hold incremental data, things that have changed in the frame compared to the previous one. Thats how mpeg reduces the file size. When you now take something like that and chop around on it, cut out pieces, even re-arrange some clips, how do you make sure that it all fits seemlessly together again? If you edit mpeg you are bound to get issues like the one you mentioned, plus a few others.

To make sure for yourself, why don't you get the trial versions of all the other editors and do exactly the same kind of thing to the same clips in all of them and look at the result? You might find though that some of the ones you mentioned won't even let you edit mpeg.

[maddrummer3301]

>>>Do alternative products, like Pinnacle Studio have the same problem? Do Ulead acknowledge the issue? Is there a fix planned?

What issue? You haven't stated what version of MF your using or what your trying to do.

MD

[jcc]

MD

Bit more info in his previous thread

http://phpbb.ulead.com.tw/EN/viewtopic.php?t=8384

[jdcampbell]

Don't know how much you know about mpeg2 compression (DVD). Depending on the size of the GOP, there will be a considerable number of frames in between the I frames. Only I frames hold all the information. All frames in between only hold incremental data, things that have changed in the frame compared to the previous one. Thats how mpeg reduces the file size. When you now take something like that and chop around on it, cut out pieces, even re-arrange some clips, how do you make sure that it all fits seemlessly together again? If you edit mpeg you are bound to get issues like the one you mentioned, plus a few others.

To make sure for yourself, why don't you get the trial versions of all the other editors and do exactly the same kind of thing to the same clips in all of them and look at the result? You might find though that some of the ones you mentioned won't even let you edit mpeg.

This is all a bit of a "red herring". Basically when you edit the programin MOviefactory and replay it there is no synchronisation problem. So the software can cope with the editing fine. It is just in saving it back to the DVD there is a problem. Seems illogical that it can cope with the editing but not reburning it back to the dvd. It suggests poor software to me. I reiterate: it shouldn't be this difficult if the software was any good.

[rdsatkaycee]

The issue is the subject "Synch issue: is it unique to Moviefactory?" and is commn to all versions as about 10 percent of the posts suggests.

[heinz-oz]

Don't know how much you know about mpeg2 compression (DVD). Depending on the size of the GOP, there will be a considerable number of frames in between the I frames. Only I frames hold all the information. All frames in between only hold incremental data, things that have changed in the frame compared to the previous one. Thats how mpeg reduces the file size. When you now take something like that and chop around on it, cut out pieces, even re-arrange some clips, how do you make sure that it all fits seemlessly together again? If you edit mpeg you are bound to get issues like the one you mentioned, plus a few others.

To make sure for yourself, why don't you get the trial versions of all the other editors and do exactly the same kind of thing to the same clips in all of them and look at the result? You might find though that some of the ones you mentioned won't even let you edit mpeg.

This is all a bit of a "red herring". Basically when you edit the programin MOviefactory and replay it there is no synchronisation problem. So the software can cope with the editing fine. It is just in saving it back to the DVD there is a problem. Seems illogical that it can cope with the editing but not reburning it back to the dvd. It suggests poor software to me. I reiterate: it shouldn't be this difficult if the software was any good.

The problem is not in the editing phase. That's why you see nothing wrong there. It happens at the encoding stage when the sound is remuxed.
it' easy enough to avoid, don't edit mpeg

[maddrummer3301]

Thanks Jcc for the reference,

JdCambell,
If your recording onto a dvd-rw disk using the -VR format that mpeg
format is an "Editable" format. "Editable" meaning you can cut/trim and extract sections from the video. That is the -VR format.
MF4 is advertised to do that.

Most desktop recorders are recording dolby 2 channel for the audio.
It sounds like your choosing "Edit Disk" to cut the video and write
back to the dvd.
The trial version may be limited to mpg or pcm audio. That might
cause the problem.
I've edited disks using MF4 recorded on a sony dvd recorder in -VR
mode and used the "Edit Disk" module and they work.

Maybe something in the trial version is causing this because of the audio being dolby.

It does help to post the recorder model and the mode (HQ/SD) of the
recording along with the format (-VR/+VR _ dvd-video).

MD

[ploggy]

i've had my share of sync problems with roxio and powerdvd, so im pretty sure this problem is not unique to MovieFactory. what they say about MPEG editing is right... there are different ways of encoding MPEG so its pretty hard to edit them if you consider the GOPs.

av sync can also be caused by dropped frames when the video was captured since there missing information in the video stream.